CGH (computer generated hologram)
At the beginning, what does a simple CGH look like: It's been a while since the last entry, nevertheless today I will present some work that I did one month ago. For the first time I tried to make my own calculation of a hologram. It was an easy approach, first a simple phase hologram, where you take only the phase of the light recorded on a real hologram. The results were not that good (I didn't take a photo of it, but there was not much to see). Then I started with a more complicated algorithm, but still very simple CGH (computer generated hologram) - IFTA (Iterative Fourier Transform Algorithm) also known as Gerchberg-Saxton algorithm. The results were somehow better but still some work has to be done. The input picture is shown in fig2 -a very simple image. After feeding it to the program that I wrote in python I got three outputs, first how does the picture look after 200 iterations of the program. Since IFTA is an iteration algorithm with each iteration the